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We introduce a simple procedure for high-Q cavity design in photonic crystal heterostructures. The key parameter in the optimization process is the relative position of the resonant frequency within the mode-gap.
We present the first demonstration of ultra-low power four-wave-mixing in a high-index glass micro-ring resonator (47.5 mum radius). By using a mW-level CW pump power we obtained an appreciable wavelength conversion in the C-band.
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